Electrical precipitator



1 k Bi Aug. 11, 1953 Filed Aug. 28 1951 s. R. ALLAN 2,648,394

ELECTRICAL PRECIPITATOR 4 Sheets-Sheet l INVENTOR ATTORNEY Au 11, 1953 LLAN ELECTRICAL PRECIPITATOR 4 Sheets-Sheet 2 Filed Aug. 28, 1951 INVENTUR SZZ/arf H AZ/an @QQQ MQQQQ ATTORNEY Aug. 11, 1953 ALI-AN 2,648,394

ELECTRICAL PRECIPITATOR Filed Aug. 28, 1951 4 Sheets-Sheet 5 INVENTOR SZZzar-Z A]]an ATTORNEY Aug. 11, 1953 ALLAN 2,648,394

ELECTRICAL PRECIPITATOR Filed Aug. 28, 1951 4 Sheets-Sheet 4 f0 INVENTOR Slizarf H All/c??? (jig-weep? ATTORNEY Patented Aug. 11, 1953 r ELECTRICAL PRECIPITATOR Stuart B. Allan, Somerville, N. J., assignor to Research Corporation, New York, N. Y., a corporation of New York Application August 28, 1951, Serial No. 243,956

Claims. 1

This invention relates to electrical precipitators and is particularly directed to electrical precipitators having pipe collecting electrodes.

A principal purpose of the invention is the provision of an electrical precipitator having a maximum capacity with low space requirements.

It is common practice in precipitators having pipe collecting electrodes to introduce the gas to be cleaned at the sides of the precipitator below the level of the tops of the pipes, the gas then passing up through the interior of the pipes and out through one or more outlet in the top of the precipitator. However, side gas inlets require a substantial amount of space, which is not always available.

In the electrical precipitator of the invention the gases to be purified are introduced into the space between the pipe collecting electrodes by means of a plurality of conduits passing downward through the roof of the precipitator and the vertical partition just below the tops of the pipes into the space between the pipes and the side walls of the precipitator shell. It has been found to be particularly advantageous to direct the gas leaving the down-take conduits laterally towards the center of the precipitator and to provide flow control means, such as dampers, in the inlet conduits in order to obtain an even distribution of the gas flowing upwardly through the pipe electrodes.

The invention will be more particularly described and the principles thereof illustrated in the accompanying drawings in which:

Fig. 1 is an elevation in partial section of an electrical precipitator embodying the invention;

Fig. 2 is a plan view in partial section on line 2-2 of Fig. 1;

Fig. 3 is a side elevation in partial section on line 3--3 of Fig. 2;

Fig. 4 is an elevation in partial section of another embodiment of the invention;

Fig. 5 is a plan view in partial section on line 5-5 of Fig. 4;

Fig. 6 is a sectional elevation of a modified form of the gas inlet conduit of the invention; and

Fig. '7 is a fragmentary view showing the outlet end of the inlet conduit of Fig. 6.

In Figs. 1 to 3, I0 is the shell of the precipitator having a hopper bottom with outlet II for precipitated material. Suspended at their upper ends in a horizontal partition I2, as is well known in the art, are a plurality of pipe collecting electrodes I3. Discharge electrodes I4 are suspended in the center of each pipe from the high tension supports I5 carried on insulators I6. The insulators are preferably encased in housings II. The discharge electrodes I4 are maintained in alignment by rods I8 and weights I9. The high tension system is energized through bushing 20.

The precipitator is divided into two sections by a vertical partition 2|. Each section is provided with a gas outlet 22 and inlet conduits 23.

The inlet conduits 23 pass downwardly through partition I2, which may be perforated here for the passage of gases as shown to provide flowrestricting means to render the flow of gas more uniform as it approaches the top of the turning vanes, and open into the space between pipes I3 below the partition, being terminated at their lower ends by plates 24. Flow directing vanes 25, which may be perforated, are provided in the lower ends of inlet conduits 23.

At their upper ends the gas inlet conduits are connected to the gas supply lines 26. The gas inlet conduits preferably contain one or more dampers 2! for regulating the distribution of gas between them. Spray nozzles 28 positioned in the upper portions of the gas inlet conduits serve to flush deposited material out of their lower ends.

In operation, the gas to be cleaned supplied by lines 26 passes downwardly through gas inlet conduits 23, being directed laterally at the lower ends thereof into the space between the pipes I3, from which the gas passes upwardly through the pipes I3 into the top header of the precipitator and out through outlet 22.

The apparatus of Figs. 4 and 5, differs from that of Figs. 1 to 3 in lacking the central vertical partition 2 I, and in suitable modifications of the gas inlet conduits. Like elements of the apparatus of Figs. 4 and 5 are given the same reference numerals as in Figs. 1 to 3. There is only a single gas supply line 26 opening into two symmetrically positioned gas inlet conduits 23 similar in construction and arrangement to the corresponding gas inlet conduits of Figs. 1 to 3.

Various modifications may be made in the design and arrangement of the gas inlet conduits. The flow directing vanes 25 may be solid sheets or may be perforated over all or a part thereof.

A modified form of gas inlet conduit 23 is shown in Figs. 6 and 7 in which the lower portion of the inlet conduit is bent inwardly and simultaneously flared out laterally into a horizontally directed mouth 23'.

I claim:

1. In an electrical precipitator including a shell having a horizontal partition therein, a plurality of vertical pipe collecting electrodes and associated discharge electrodes passing through the partition, a gas outlet in the shell above the partition, gas inlet means including a plurality of conduits passing through the top of the shell and said horizontal partition to a zone between the pipe" collecting electrodes and. the side of the shell and gas flow directing means below the partition directing the flow of gas from said conduits laterally between the pipe collecting electrodes.

2. In an electrical precipitator including a shell having a horizontal partition therein, a plurality of vertical pipe collecting electrodes and associated discharge electrodes passing through the partition, a gas outlet in the shell above the partition, gas inlet means including a plurality of conduits passing through the top of the shell and said horizontal partition to a zone between the pipe collecting electrodes and the side of the shell, gas flow directing means below the partition directing the flow of gas from said conduits laterally between the pipe collecting electrodes, and gas fiow control means in at least one of said inlet conduits.

3. In an electrical precipitator including a shell having a horizontal partition therein, a plurality of vertical pipe collecting electrodes and. associated discharge electrodes passing through the partition, a gas outlet in the shell above the partition, gas inlet means including .a, plurality of conduits passing through the top of the shell and said horizontal partition to a zone between the pipe collecting electrodes and the side of the shell and curved vanes in the conduits below the partition directing the flow of gas from said conduits laterally between the pipe collecting electrodes.

4. In an electrical precipitator including a shell having a horizontal partition therein, a plurality of vertical pipe collecting electrodes and associated discharge electrodes passing through the partition, a gas outlet in the shell above the partition, gas inlet means including a plurality of conduits passing through the top of the shell and said horizontal partition to a zone between the pipe collecting electrodes and the side of the shell and a laterally directed outlet at the lower end of the conduits below the partition directing the flowv of gas from said conduits laterally between the pipe collecting electrodes.

5. An electrical precipitator comprising a shell having a cylindrical vertically extending body, a top provided with a. gas outlet and a hopper bottom, a horizontal partition below the top, a substantially rectangular array of vertical pipe collecting electrodes passing through the horizontal partition, gas inlet means including a plurality of conduits passing through the top of theshell and said horizontal partitionto a zone between the pipe collecting electrodes and the side ofthe shell and gas flow directing, means below the partition directing the flow of gas fromsaid con-.

duits laterally between the pipe collecting electrodes.

STUART R. ALLAN.

References Cited in thefile of this patent UNITED STATES PATENTS Date 

